Avoid clearing transaction flags too early

Transaction flags were cleared in commitTransactions  before
checking if we needed to run the composite stage. This caused
us to miss some updates. In addition, display  color matrix is only
updated if the colorMatrixChanged is set so, if we miss an update
device would be in an invalid state until the next update.

Fixes: 300194609
Test: presubmit
Change-Id: Ie397d4c37af6b54ff8d59e1151ddee24811e2d13